This "paper" of notes from the official Steam update details exactly what was in the v1.08 zip file:
Introduced the ability to view a graph of your performance after completing a song. FГЎjl: Trombone.Champ.v1.08.zip ...
The specific file refers to an update (Version 1.08) for the comedy rhythm game Trombone Champ , released around October 30, 2022. This "paper" of notes from the official Steam
If you are looking for an academic "paper" analyzing why this game became a cultural phenomenon, these sources are highly relevant: released around October 30